Prex Home / Browse Source - Prex Version: 0.9.0

root/usr/test/fifo/fifo.c

DEFINITIONS

1. main

   1 /*
   2  * Copyright (c) 2008, Kohsuke Ohtani
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. Neither the name of the author nor the names of any co-contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  30 /*
  31  * fifo.c - test FIFO function
  32  */
  34 #include <sys/prex.h>
  35 #include <sys/fcntl.h>
  36 #include <sys/stat.h>
  37 #include <sys/errno.h>
  39 #include <stdio.h>
  40 #include <stdlib.h>
  41 #include <string.h>
  42 #include <unistd.h>
  44 int
main(int argc, char *argv[])
  46 {
  47         int pid, fd1, fd2, len;
  48         char buf1[256], buf2[256];
printf("FIFO test program\n");
  52         if (mknod("/mnt/fifo/test", (mode_t)(S_IFIFO | 0666), 0) == -1) {
perror("mkfifo");
exit(1);
  55         }
pid = vfork();
  57         if (pid == -1) {
perror("fork");
exit(1);
  60         }
  61         if (pid == 0) {
  62                 /* child */
printf("child: task=%x\n", (int)task_self());
fd1 = open("/mnt/fifo/test", O_RDONLY);
  66                 if (fd1 == -1) {
perror("open");
exit(1);
  69                 }
  70                 for (;;) {
printf("child: reading data from FIFO\n");
len = read(fd1, buf1, sizeof(buf1) - 1);
  73                         if (len == 0)
  74                                 break;
buf1[len] = '\0';
printf("child: length=%d data=%s\n", len, buf1);
  77                 }
close(fd1);
printf("child: exit\n");
exit(0);
  81         }
printf("parent: task=%x\n", (int)task_self());
fd2 = open("/mnt/fifo/test", O_WRONLY);
  85         if (fd2 == -1) {
perror("open");
exit(1);
  88         }
  89         for (;;) {
printf("parent: please input string...\n");
fgets(buf2, sizeof(buf2) - 1, stdin);
  92                 if (feof(stdin))
  93                         break;
printf("parent: writing to FIFO\n");
write(fd2, buf2, strlen(buf2));
  96         }
close(fd2);
printf("parent: exit\n");
exit(0);
 100         return 0;
 101 }